java图形验证码生成工具类 web页面校验验证码

import javax.imageio.ImageIO;  import java.awt.*;  import java.awt.image.BufferedImage;  import java.io.FileOutputStream;  import java.io.IOException;  import java.io.OutputStream;  import java.util.Date;  import java.util.Random;    /**   * 验证码生成器   *   * @author   */  public class ValidateCode {    // 图片的宽度。    private int width = 160;    // 图片的高度。    private int height = 40;    // 验证码字符个数    private int codeCount = 5;    // 验证码干扰线数    private int lineCount = 150;    // 验证码    private String code = null;    // 验证码图片Buffer    private BufferedImage buffImg = null;      // 验证码范围,去掉0(数字)和O(拼音)容易混淆的(小写的1和L也可以去掉,大写不用了)    private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',        'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',        'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9'};      /**     * 默认构造函数,设置默认参数     */    public ValidateCode() {      this.createCode();    }      /**     * @param width 图片宽     * @param height 图片高     */    public ValidateCode(int width, int height) {      this.width = width;      this.height = height;      this.createCode();    }      /**     * @param width   图片宽     * @param height  图片高     * @param codeCount 字符个数     * @param lineCount 干扰线条数     */    public ValidateCode(int width, int height, int codeCount, int lineCount) {      this.width = width;      this.height = height;      this.codeCount = codeCount;      this.lineCount = lineCount;      this.createCode();    }      public void createCode() {      int x = 0, fontHeight = 0, codeY = 0;      int red = 0, green = 0, blue = 0;        x = width / (codeCount + 2);//每个字符的宽度(左右各空出一个字符)      fontHeight = height - 2;//字体的高度      codeY = height - 4;        // 图像buffer      buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);      Graphics2D g = buffImg.createGraphics();      // 生成随机数      Random random = new Random();      // 将图像填充为白色      g.setColor(Color.WHITE);      g.fillRect(0, 0, width, height);      // 创建字体,可以修改为其它的      Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);  //    Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight);      g.setFont(font);        for (int i = 0; i < lineCount; i++) {        // 设置随机开始和结束坐标        int xs = random.nextInt(width);//x坐标开始        int ys = random.nextInt(height);//y坐标开始        int xe = xs + random.nextInt(width / 8);//x坐标结束        int ye = ys + random.nextInt(height / 8);//y坐标结束          // 产生随机的颜色值，让输出的每个干扰线的颜色值都将不同。        red = random.nextInt(255);        green = random.nextInt(255);        blue = random.nextInt(255);        g.setColor(new Color(red, green, blue));        g.drawLine(xs, ys, xe, ye);      }        // randomCode记录随机产生的验证码      StringBuffer randomCode = new StringBuffer();      // 随机产生codeCount个字符的验证码。      for (int i = 0; i < codeCount; i++) {        String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);        // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。        red = random.nextInt(255);        green = random.nextInt(255);        blue = random.nextInt(255);        g.setColor(new Color(red, green, blue));        g.drawString(strRand, (i + 1) * x, codeY);        // 将产生的四个随机数组合在一起。        randomCode.append(strRand);      }      // 将四位数字的验证码保存到Session中。      code = randomCode.toString();    }      public void write(String path) throws IOException {      OutputStream sos = new FileOutputStream(path);      this.write(sos);    }      public void write(OutputStream sos) throws IOException {      ImageIO.write(buffImg, "png", sos);      sos.close();    }      public BufferedImage getBuffImg() {      return buffImg;    }      public String getCode() {      return code;    }      /**     * 测试函数,默认生成到d盘     * @param args     */    public static void main(String[] args) {      ValidateCode vCode = new ValidateCode(160,40,5,150);      try {        String path="D:/"+new Date().getTime()+".png";        System.out.println(vCode.getCode()+" >"+path);        vCode.write(path);      } catch (IOException e) {        e.printStackTrace();      }    }  }  

// 刷新图片      function changeImg() {        var imgSrc = $("#imgObj");        var url = imgSrc.attr("src");        imgSrc.attr("src", changeUrl(url));      }      //为了使每次生成图片不一致，即不让浏览器读缓存，所以需要加上时间戳      function changeUrl(url) {        var timestamp = (new Date()).valueOf();        var index = url.indexOf("?");       console.log(index);        if (index > 0) {          url = url.substring(0, url.indexOf("?"));        }       console.log(url);       if ((url.indexOf("&") > 0)) {          url = url + "×tamp=" + timestamp;          console.log(url);       } else {          url = url + "?timestamp=" + timestamp;         console.log(url);         }        return url;      } 

/**  * 响应验证码页面  * @return  */  @RequestMapping(value="/validateCode")  public String validateCode(HttpServletRequest request,HttpServletResponse response) throws Exception{    // 设置响应的类型格式为图片格式    response.setContentType("image/jpeg");    //禁止图像缓存。    response.setHeader("Pragma", "no-cache");    response.setHeader("Cache-Control", "no-cache");    response.setDateHeader("Expires", 0);      HttpSession session = request.getSession();      ValidateCode vCode = new ValidateCode(120,40,5,100);    session.setAttribute("code", vCode.getCode());    vCode.write(response.getOutputStream());    return null;  }  

String code = request.getParameter("code");  HttpSession session = request.getSession();  String sessionCode = (String) session.getAttribute("code");  if (!StringUtils.equalsIgnoreCase(code, sessionCode)) { //忽略验证码大小写    throw new RuntimeException("验证码对应不上code=" + code + " sessionCode=" + sessionCode);  }